智齿冠周炎是指什么牙位发生的炎症()
A.下颌第1磨牙
B.下颌第2磨牙
C.下颌第3磨牙
D.上颌第3磨牙
E.上、下颌第3磨牙
参考答案:C
At last, Lucy make the baby _____ and the baby began to laugh. [ ]
A. stop crying
B. to stop crying
C. stop to say
D. to stop to cry